#include "ext4_blockdev.h"
#include "tree.h"
+#include <stddef.h>
#include <stdint.h>
+#define EXT4_CHECKSUM_CRC32C 1
+
/*
* Structure of the super block
*/
uint64_t mmp_block; /* Block for multi-mount protection */
uint32_t raid_stripe_width; /* Blocks on all data disks (N * stride) */
uint8_t log_groups_per_flex; /* FLEX_BG group size */
- uint8_t reserved_char_pad;
+ uint8_t checksum_type;
uint16_t reserved_pad;
uint64_t kbytes_written; /* Number of lifetime kilobytes written */
uint32_t snapshot_inum; /* I-node number of active snapshot */
uint64_t last_error_block; /* Block involved of last error */
uint8_t last_error_func[32]; /* Function where the error happened */
uint8_t mount_opts[64];
- uint32_t padding[112]; /* Padding to the end of the block */
+ uint32_t usr_quota_inum; /* inode for tracking user quota */
+ uint32_t grp_quota_inum; /* inode for tracking group quota */
+ uint32_t overhead_clusters; /* overhead blocks/clusters in fs */
+ uint32_t backup_bgs[2]; /* groups with sparse_super2 SBs */
+ uint8_t encrypt_algos[4]; /* Encryption algorithms in use */
+ uint8_t encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
+ uint32_t lpf_ino; /* Location of the lost+found inode */
+ uint32_t padding[100]; /* Padding to the end of the block */
+ uint32_t checksum; /* crc32c(superblock) */
} __attribute__((packed));
#define EXT4_SUPERBLOCK_MAGIC 0xEF53
/*
* Compatible features
*/
-#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
-#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
-#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
-#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
-#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
-#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
+#define EXT4_FCOM_DIR_PREALLOC 0x0001
+#define EXT4_FCOM_IMAGIC_INODES 0x0002
+#define EXT4_FCOM_HAS_JOURNAL 0x0004
+#define EXT4_FCOM_EXT_ATTR 0x0008
+#define EXT4_FCOM_RESIZE_INODE 0x0010
+#define EXT4_FCOM_DIR_INDEX 0x0020
/*
* Read-only compatible features
*/
-#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
-#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
-#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
-#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
-#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
-#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
-#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
-#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
-#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
-#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
+#define EXT4_FRO_COM_SPARSE_SUPER 0x0001
+#define EXT4_FRO_COM_LARGE_FILE 0x0002
+#define EXT4_FRO_COM_BTREE_DIR 0x0004
+#define EXT4_FRO_COM_HUGE_FILE 0x0008
+#define EXT4_FRO_COM_GDT_CSUM 0x0010
+#define EXT4_FRO_COM_DIR_NLINK 0x0020
+#define EXT4_FRO_COM_EXTRA_ISIZE 0x0040
+#define EXT4_FRO_COM_QUOTA 0x0100
+#define EXT4_FRO_COM_BIGALLOC 0x0200
+#define EXT4_FRO_COM_METADATA_CSUM 0x0400
/*
* Incompatible features
*/
-#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
-#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
-#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
-#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
-#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
-#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
-#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
-#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
-#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
-#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
-#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
-#define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
-#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
-#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
+#define EXT4_FINCOM_COMPRESSION 0x0001
+#define EXT4_FINCOM_FILETYPE 0x0002
+#define EXT4_FINCOM_RECOVER 0x0004 /* Needs recovery */
+#define EXT4_FINCOM_JOURNAL_DEV 0x0008 /* Journal device */
+#define EXT4_FINCOM_META_BG 0x0010
+#define EXT4_FINCOM_EXTENTS 0x0040 /* extents support */
+#define EXT4_FINCOM_64BIT 0x0080
+#define EXT4_FINCOM_MMP 0x0100
+#define EXT4_FINCOM_FLEX_BG 0x0200
+#define EXT4_FINCOM_EA_INODE 0x0400 /* EA in inode */
+#define EXT4_FINCOM_DIRDATA 0x1000 /* data in dirent */
+#define EXT4_FINCOM_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
+#define EXT4_FINCOM_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
+#define EXT4_FINCOM_INLINE_DATA 0x8000 /* data in inode */
/*
* EXT2 supported feature set
*/
-#define EXT2_FEATURE_COMPAT_SUPP 0x0000
+#define EXT2_SUPPORTED_FCOM 0x0000
-#define EXT2_FEATURE_INCOMPAT_SUPP \
- (EXT4_FEATURE_INCOMPAT_FILETYPE | EXT4_FEATURE_INCOMPAT_META_BG)
+#define EXT2_SUPPORTED_FINCOM \
+ (EXT4_FINCOM_FILETYPE | EXT4_FINCOM_META_BG)
-#define EXT2_FEATURE_RO_COMPAT_SUPP \
- (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER | \
- EXT4_FEATURE_RO_COMPAT_LARGE_FILE | EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
+#define EXT2_SUPPORTED_FRO_COM \
+ (EXT4_FRO_COM_SPARSE_SUPER | \
+ EXT4_FRO_COM_LARGE_FILE)
/*
* EXT3 supported feature set
*/
-#define EXT3_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_DIR_INDEX)
+#define EXT3_SUPPORTED_FCOM (EXT4_FCOM_DIR_INDEX)
-#define EXT3_FEATURE_INCOMPAT_SUPP \
- (EXT4_FEATURE_INCOMPAT_FILETYPE | EXT4_FEATURE_INCOMPAT_META_BG)
+#define EXT3_SUPPORTED_FINCOM \
+ (EXT4_FINCOM_FILETYPE | EXT4_FINCOM_META_BG)
-#define EXT3_FEATURE_RO_COMPAT_SUPP \
- (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER | \
- EXT4_FEATURE_RO_COMPAT_LARGE_FILE | EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
+#define EXT3_SUPPORTED_FRO_COM \
+ (EXT4_FRO_COM_SPARSE_SUPER | EXT4_FRO_COM_LARGE_FILE)
/*
* EXT4 supported feature set
*/
-#define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_DIR_INDEX)
+#define EXT4_SUPPORTED_FCOM (EXT4_FCOM_DIR_INDEX)
-#define EXT4_FEATURE_INCOMPAT_SUPP \
- (EXT4_FEATURE_INCOMPAT_FILETYPE | EXT4_FEATURE_INCOMPAT_META_BG | \
- EXT4_FEATURE_INCOMPAT_EXTENTS | EXT4_FEATURE_INCOMPAT_FLEX_BG | \
- EXT4_FEATURE_INCOMPAT_64BIT)
+#define EXT4_SUPPORTED_FINCOM \
+ (EXT4_FINCOM_FILETYPE | EXT4_FINCOM_META_BG | \
+ EXT4_FINCOM_EXTENTS | EXT4_FINCOM_FLEX_BG | \
+ EXT4_FINCOM_64BIT)
-#define EXT4_FEATURE_RO_COMPAT_SUPP \
- (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER | \
- EXT4_FEATURE_RO_COMPAT_LARGE_FILE | EXT4_FEATURE_RO_COMPAT_GDT_CSUM | \
- EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
- EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
- EXT4_FEATURE_RO_COMPAT_BTREE_DIR | EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
+#define EXT4_SUPPORTED_FRO_COM \
+ (EXT4_FRO_COM_SPARSE_SUPER | \
+ EXT4_FRO_COM_METADATA_CSUM | \
+ EXT4_FRO_COM_LARGE_FILE | EXT4_FRO_COM_GDT_CSUM | \
+ EXT4_FRO_COM_DIR_NLINK | \
+ EXT4_FRO_COM_EXTRA_ISIZE | EXT4_FRO_COM_HUGE_FILE)
/*Ignored features:
* RECOVER - journaling in lwext4 is not supported
* (probably won't be ever...)
* MMP - multi-mout protection (impossible scenario)
* */
-#define FEATURE_INCOMPAT_IGNORED \
- EXT4_FEATURE_INCOMPAT_RECOVER | EXT4_FEATURE_INCOMPAT_MMP
+#define EXT_FINCOM_IGNORED \
+ EXT4_FINCOM_RECOVER | EXT4_FINCOM_MMP
#if 0
/*TODO: Features incompatible to implement*/
-#define EXT4_FEATURE_INCOMPAT_SUPP
- (EXT4_FEATURE_INCOMPAT_INLINE_DATA)
+#define EXT4_SUPPORTED_FINCOM
+ (EXT4_FINCOM_INLINE_DATA)
/*TODO: Features read only to implement*/
-#define EXT4_FEATURE_RO_COMPAT_SUPP
- EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
- EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
- EXT4_FEATURE_RO_COMPAT_QUOTA)
+#define EXT4_SUPPORTED_FRO_COM
+ EXT4_FRO_COM_BIGALLOC |\
+ EXT4_FRO_COM_QUOTA)
#endif
struct ext4_fs {
uint16_t file_acl_high;
uint16_t uid_high;
uint16_t gid_high;
- uint32_t reserved2;
+ uint16_t checksum_lo; /* crc32c(uuid+inum+inode) LE */
+ uint16_t reserved2;
} linux2;
struct {
uint16_t reserved1;
} __attribute__((packed)) osd2;
uint16_t extra_isize;
- uint16_t pad1;
+ uint16_t checksum_hi; /* crc32c(uuid+inum+inode) BE */
uint32_t ctime_extra; /* Extra change time (nsec << 2 | epoch) */
uint32_t mtime_extra; /* Extra Modification time (nsec << 2 | epoch) */
uint32_t atime_extra; /* Extra Access time (nsec << 2 | epoch) */
EXT4_DIRENTRY_SOCK,
EXT4_DIRENTRY_SYMLINK };
-union ext4_directory_entry_ll_internal {
+#define EXT4_DIRENTRY_DIR_CSUM 0xDE
+
+union ext4_dir_entry_ll_internal {
uint8_t name_length_high; /* Higher 8 bits of name length */
uint8_t inode_type; /* Type of referenced inode (in rev >= 0.5) */
} __attribute__((packed));
/**
* Linked list directory entry structure
*/
-struct ext4_directory_entry_ll {
+struct ext4_dir_entry_ll {
uint32_t inode; /* I-node for the entry */
uint16_t entry_length; /* Distance to the next directory entry */
uint8_t name_length; /* Lower 8 bits of name length */
- union ext4_directory_entry_ll_internal in;
+ union ext4_dir_entry_ll_internal in;
uint8_t name[EXT4_DIRECTORY_FILENAME_LEN]; /* Entry name */
} __attribute__((packed));
-struct ext4_directory_iterator {
+struct ext4_dir_iterator {
struct ext4_inode_ref *inode_ref;
struct ext4_block current_block;
uint64_t current_offset;
- struct ext4_directory_entry_ll *current;
+ struct ext4_dir_entry_ll *current;
};
-struct ext4_directory_search_result {
+struct ext4_dir_search_result {
struct ext4_block block;
- struct ext4_directory_entry_ll *dentry;
+ struct ext4_dir_entry_ll *dentry;
};
/* Structures for indexed directory */
-struct ext4_directory_dx_countlimit {
+struct ext4_dir_idx_countlimit {
uint16_t limit;
uint16_t count;
};
-struct ext4_directory_dx_dot_entry {
+struct ext4_dir_idx_dot_entry {
uint32_t inode;
uint16_t entry_length;
uint8_t name_length;
uint8_t name[4];
};
-struct ext4_directory_dx_root_info {
+struct ext4_dir_idx_root_info {
uint32_t reserved_zero;
uint8_t hash_version;
uint8_t info_length;
uint8_t unused_flags;
};
-struct ext4_directory_dx_entry {
+struct ext4_dir_idx_entry {
uint32_t hash;
uint32_t block;
};
-struct ext4_directory_dx_root {
- struct ext4_directory_dx_dot_entry dots[2];
- struct ext4_directory_dx_root_info info;
- struct ext4_directory_dx_entry entries[];
+struct ext4_dir_idx_root {
+ struct ext4_dir_idx_dot_entry dots[2];
+ struct ext4_dir_idx_root_info info;
+ struct ext4_dir_idx_entry entries[];
};
-struct ext4_fake_directory_entry {
+struct ext4_fake_dir_entry {
uint32_t inode;
uint16_t entry_length;
uint8_t name_length;
uint8_t inode_type;
};
-struct ext4_directory_dx_node {
- struct ext4_fake_directory_entry fake;
- struct ext4_directory_dx_entry entries[];
+struct ext4_dir_idx_node {
+ struct ext4_fake_dir_entry fake;
+ struct ext4_dir_idx_entry entries[];
};
-struct ext4_directory_dx_block {
+struct ext4_dir_idx_block {
struct ext4_block block;
- struct ext4_directory_dx_entry *entries;
- struct ext4_directory_dx_entry *position;
+ struct ext4_dir_idx_entry *entries;
+ struct ext4_dir_idx_entry *position;
+};
+
+/*
+ * This goes at the end of each htree block.
+ */
+struct ext4_dir_idx_tail {
+ uint32_t reserved;
+ uint32_t checksum; /* crc32c(uuid+inum+dirblock) */
};
+/*
+ * This is a bogus directory entry at the end of each leaf block that
+ * records checksums.
+ */
+struct ext4_dir_entry_tail {
+ uint32_t reserved_zero1; /* Pretend to be unused */
+ uint16_t rec_len; /* 12 */
+ uint8_t reserved_zero2; /* Zero name length */
+ uint8_t reserved_ft; /* 0xDE, fake file type */
+ uint32_t checksum; /* crc32c(uuid+inum+dirblock) */
+};
+
+#define EXT4_DIRENT_TAIL(block, blocksize) \
+ ((struct ext4_dir_entry_tail *)(((char *)(block)) + ((blocksize) - \
+ sizeof(struct ext4_dir_entry_tail))))
+
#define EXT4_ERR_BAD_DX_DIR (-25000)
#define EXT4_LINK_MAX 65000
+#define EXT4_BAD_INO 1
+#define EXT4_ROOT_INO 2
+#define EXT4_BOOT_LOADER_INO 5
+#define EXT4_UNDEL_DIR_INO 6
+#define EXT4_RESIZE_INO 7
+#define EXT4_JOURNAL_INO 8
+
+#define EXT4_GOOD_OLD_FIRST_INO 11
+
#define EXT4_EXT_UNWRITTEN_MASK (1L << 15)
#define EXT4_EXT_MAX_LEN_WRITTEN (1L << 15)
((ex)->block_count |= to_le16(EXT4_EXT_UNWRITTEN_MASK))
#define EXT4_EXT_SET_WRITTEN(ex) \
((ex)->block_count &= ~(to_le16(EXT4_EXT_UNWRITTEN_MASK)))
+/*
+ * This is the extent tail on-disk structure.
+ * All other extent structures are 12 bytes long. It turns out that
+ * block_size % 12 >= 4 for at least all powers of 2 greater than 512, which
+ * covers all valid ext4 block sizes. Therefore, this tail structure can be
+ * crammed into the end of the block without having to rebalance the tree.
+ */
+struct ext4_extent_tail
+{
+ uint32_t et_checksum; /* crc32c(uuid+inum+extent_block) */
+};
/*
* This is the extent on-disk structure.
uint16_t magic;
uint16_t entries_count; /* Number of valid entries */
uint16_t max_entries_count; /* Capacity of store in entries */
- uint16_t depth; /* Has tree real underlying blocks? */
- uint32_t generation; /* generation of the tree */
+ uint16_t depth; /* Has tree real underlying blocks? */
+ uint32_t generation; /* generation of the tree */
};
+
+/*
+ * Types of blocks.
+ */
+typedef uint32_t ext4_lblk_t;
+typedef uint64_t ext4_fsblk_t;
+
+/*
+ * Array of ext4_ext_path contains path to some extent.
+ * Creation/lookup routines use it for traversal/splitting/etc.
+ * Truncate uses it to simulate recursive walking.
+ */
struct ext4_extent_path {
+ ext4_fsblk_t p_block;
struct ext4_block block;
- uint16_t depth;
+ int32_t depth;
+ int32_t maxdepth;
struct ext4_extent_header *header;
struct ext4_extent_index *index;
struct ext4_extent *extent;
+
};
+
#define EXT4_EXTENT_MAGIC 0xF30A
#define EXT4_EXTENT_FIRST(header) \
((struct ext4_extent_index *)(((char *)(header)) + \
sizeof(struct ext4_extent_header)))
+/*
+ * EXT_INIT_MAX_LEN is the maximum number of blocks we can have in an
+ * initialized extent. This is 2^15 and not (2^16 - 1), since we use the
+ * MSB of ee_len field in the extent datastructure to signify if this
+ * particular extent is an initialized extent or an uninitialized (i.e.
+ * preallocated).
+ * EXT_UNINIT_MAX_LEN is the maximum number of blocks we can have in an
+ * uninitialized extent.
+ * If ee_len is <= 0x8000, it is an initialized extent. Otherwise, it is an
+ * uninitialized one. In other words, if MSB of ee_len is set, it is an
+ * uninitialized extent with only one special scenario when ee_len = 0x8000.
+ * In this case we can not have an uninitialized extent of zero length and
+ * thus we make it as a special case of initialized extent with 0x8000 length.
+ * This way we get better extent-to-group alignment for initialized extents.
+ * Hence, the maximum number of blocks we can have in an *initialized*
+ * extent is 2^15 (32768) and in an *uninitialized* extent is 2^15-1 (32767).
+ */
+#define EXT_INIT_MAX_LEN (1L << 15)
+#define EXT_UNWRITTEN_MAX_LEN (EXT_INIT_MAX_LEN - 1)
+
+#define EXT_EXTENT_SIZE sizeof(struct ext4_extent)
+#define EXT_INDEX_SIZE sizeof(struct ext4_extent_idx)
+
+#define EXT_FIRST_EXTENT(__hdr__) \
+ ((struct ext4_extent *)(((char *)(__hdr__)) + \
+ sizeof(struct ext4_extent_header)))
+#define EXT_FIRST_INDEX(__hdr__) \
+ ((struct ext4_extent_index *)(((char *)(__hdr__)) + \
+ sizeof(struct ext4_extent_header)))
+#define EXT_HAS_FREE_INDEX(__path__) \
+ ((__path__)->header->entries_count < (__path__)->header->max_entries_count)
+#define EXT_LAST_EXTENT(__hdr__) \
+ (EXT_FIRST_EXTENT((__hdr__)) + (__hdr__)->entries_count - 1)
+#define EXT_LAST_INDEX(__hdr__) \
+ (EXT_FIRST_INDEX((__hdr__)) + (__hdr__)->entries_count - 1)
+#define EXT_MAX_EXTENT(__hdr__) \
+ (EXT_FIRST_EXTENT((__hdr__)) + (__hdr__)->max_entries_count - 1)
+#define EXT_MAX_INDEX(__hdr__) \
+ (EXT_FIRST_INDEX((__hdr__)) + (__hdr__)->max_entries_count - 1)
+
+#define EXT4_EXTENT_TAIL_OFFSET(hdr) \
+ (sizeof(struct ext4_extent_header) + \
+ (sizeof(struct ext4_extent) * (hdr)->max_entries_count))
+
+/*
+ * ext4_ext_next_allocated_block:
+ * returns allocated block in subsequent extent or EXT_MAX_BLOCKS.
+ * NOTE: it considers block number from index entry as
+ * allocated block. Thus, index entries have to be consistent
+ * with leaves.
+ */
+#define EXT_MAX_BLOCKS (ext4_lblk_t) (-1)
+
+#define IN_RANGE(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
+
+
+/******************************************************************************/
+
/* EXT3 HTree directory indexing */
#define EXT2_HTREE_LEGACY 0
#define EXT2_HTREE_HALF_MD4 1
} __attribute__((packed));
struct ext4_xattr_item {
+ /* This attribute should be stored in inode body */
+ bool in_inode;
+
uint8_t name_index;
char *name;
size_t name_len;
/*****************************************************************************/
+#define EXT4_CRC32_INIT (0xFFFFFFFFUL)
+
+/*****************************************************************************/
#ifdef CONFIG_BIG_ENDIAN
static inline uint64_t to_le64(uint64_t n)
{
(s, f, v) do { (s)->f = (v); } \
while (0)
+
+#ifdef __GNUC__
+#ifndef __unused
+#define __unused __attribute__ ((__unused__))
+#endif
+#endif
+
+#ifndef offsetof
+#define offsetof(type, field) \
+ ((size_t)(&(((type *)0)->field)))
+#endif
+
#endif /* EXT4_TYPES_H_ */
/**
projects / lwext4.git / blobdiff